Lower Mack Insulator Pad, PU material Part Reference: 325-124/10QK389 Lower Mack Insulator Pad1. Material: PU2. Suited Market: USA, CANADA, CENTER AMERICAN market3. Part No: 325-124/10QK3894. Description: Lower Mack Insulator Pad Thickness: 4" Width: 7" Length: 7" Dowel: 2" Durometer: 90